Tracing heat loss coefficient

[mfqd13]

Hi,

I'm trying to calculate de heat loss coefficient, for a traced line.
It's easy to calculate the heat loss coefficient for a normal pipe with a known insulation thickness, how if we're dealing with a heat tracing case???

In my case i have bituminous products that flow in a pipe and have a tracing pipe whit hot thermal oil in it, and both are insulated together.

I've searched in every book i gave and i saw no reference to this kind of situations.
Can anyone help me?

Thanks!!

 

[abcmex]

Dear Mr Dias,
I would recommend to consult the Chapter B6 of the "Piping Handbook" Nayyar et al. Mcgraw Hill

RGS

 

[IRstuff]

Why would it be that different? For every section of pipe, you have the heat of the flow and the heat of the heater. The combination is then subjected to the loss through the insulation.

TTFN

FAQ731-376

 

[mfqd13]

I will take a look in Piping Handbook.
Thanks!!

 

[mfqd13]

I have taken a look to Piping Handbook and remembered that i'v alrealy saw it earlier.
The talks mostly about electric tracing. It presents only a table with some heat loss values, but i didn't understand if it was related to electric or steam tracing.

I will consider only the main pipe. Is this a correct approach???

I can't find any specific calculation for this application.

 

[vpl]

Marcos

You might also look at "pipe in pipe" heat exchangers, if you have access to a heat transfer book. The following one is available for free:

http://web.mit.edu/lienhard/

http://www/ahtt.html

Patricia Lougheed

******

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[mfqd13]

Again,

I've tried earlier that book, but i will give it another try.... maybe i missed something...

Thanks!